Turning an ISO or other similar image into a bootable USB drive is easy enough, however, what if you wanted to have the option to load multiple ISO, BIN or image files? This can probably be done with GRUB, but if you want as easier way, try YUMI from http://www.pendrivelinux.com

Direct Link: http://www.pendrivelinux.com/yumi-multiboot-usb-creator/

Hint: If you’re using a custom iso, for example, a Windows OS install, make sure there are no spaces in the iso file. After using the wizard, you can edit the title of the iso via the menu.1st file on the USB drive